LTC3867_15 Datasheet, PDF (7/36 Pages) Linear Technology – Low IQ, Dual 2-Phase Synchronous Step-Down Controller

TYPICAL PERFORMANCE CHARACTERISTICS
LTC3867
Current Sense Threshold
vs I_TH Voltage
75
I_LIM = INTV_CC
60
I_LIM = 3.7V
45
I_LIM = FLOAT
30
I_LIM = 1.5V
15
I_LIM = GND
0
–15
–30
0 0.25 0.5 0.75 1 1.25 1.5 1.75 2
I_TH VOLTAGE (V)
3867 G09
Maximum Current Sense
Voltage vs Feedback Voltage
(Current Foldback)
80
70
I_LIM = INTV_CC
I_LIM = 3.7V
60
50
I_LIM = FLOAT
I_LIM = 1.5V
40
I_LIM = GND
30
20
10
0 100 200 300 400 500 600
FEEDBACK VOLTAGE (V)
3867 G12
UVLO Threshold (INTV_CC)
vs Temperature
4.25
4.00
RISING
3.75
3.50
FALLING
3.25
3.00
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3867 G16
Maximum Current Sense Threshold
vs Common Mode Voltage
80
70
I_LIM = INTV_CC
I_LIM = 3.7V
60
I_LIM = FLOAT
50
40
I_LIM = 1.5V
30
I_LIM = GND
20
02
4 6 8 10 12 14
V_SENSE COMMON MODE VOLTAGE (V)
3867 G10
Shutdown (RUN) Threshold
vs Temperature
1.30
1.25
ON
1.20
1.15
OFF
1.10
1.05
1.00
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3867 G14
Oscillator Frequency
vs Temperature
660
640
620
600
580
560
540
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3867 G17
Maximum Current Sense
Threshold vs Duty Cycle
80
I_LIM = INTV_CC
70
60
I_LIM = 3.7V
I_LIM = FLOAT
50
I_LIM = 1.5V
40
I_LIM = GND
30
20
0 10 20 30 40 50 60 70 80 90 100
DUTY CYCLE (%)
3867 G11
Regulated Feedback Voltage
vs Temperature
0.606
0.604
0.602
0.600
0.598
0.596
0.594
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3867 G15
Oscillator Frequency
vs Input Voltage
620
615
610
605
600
595
590
585
580
5 10 15 20 25 30 35 40
INPUT VOLTAGE (V)
3867 G18
3867f
7